Burner



Aug. 24 1926. `1,597,386

c. A. NORALL BURNER Filed oct. 5 1925 i 2' 5a l Patented Aug. 24, 1925.

y items@ CARL A. NOBALL, OF LOS ANGELES, CALIFORNIA.

BURNER.

Application filed October My invention is an oil burner of the steam injection type, in which a jet of steam atomizes and spreads the oil and sucks the air into the burner forming a mixture of oil, air and steam. f

An object of my invention is to provide an oil burner in which the oil outlet is positioned above the steam jet and with the air inlets laterally positioned relative to the steam iet and slightly below the oil inlet, to obtain an improved mixing of the oil, air and steam. Another feature of my invention is the construction of a flattened mixing chamber in the mixing nozzle, having a hori- L zontal orifice in the form of a. slot giving a horizontal spread to the fuel. Another feature of my nozzle and burner construction is the provision of an air space between the inlet nozzles and the body of the outlet nozzle, whereby a circulation of air may be established when the burner is shut off, thus cooling the burner of the heat radiated from the' furnace walls. Y

My invention will be more readily understood from the following description taken together with the drawings in which Figure 1 is a plan view of my burner, showing the iiattened construction of the outlet nozzle and the eiland air feed pipes.

Figure 2 is a side elevation taken in the direction of the arrow 2 of Figure 1.

Figure3 is a vertical longitudinal section on the line 3-3 of Figure 1 in the direction of the arrows.

Figure 4 is a horizontal section on the line 44-4 of Figure 2 in the direction of the arrows.

.Figure 5 is a vertical transverse section on the line 5-5 of Figure 3 in the direction Vof the arrows.

Figure 6 is a front or end view of the inlet nozzles taken in the directionV of. the.

arrow 6 of Figure 4.

Figure 7 is a plan view of the inlet nozzles taken in the direction of the arrow 7 of. Figure 6.

Figure 8 is a detail horizontal sec-tion of the mixing nozzle, with the inlet nozzle removed, as if taken on the line 4W4v of Figure 2. l

In the drawings the burner fuel inlet nozzles are contained in the inlet nozzle body 1 having a central steam inlet pipe 2, ank

oil pipe 3 directly above the steam pipe and two lateral air pipes 4 and 5 screwthreaded into the inlet nozzle body. This nozzle body 5, 1925. semaine- 60,641.

has a flange 6 at its rearward end a parallel threaded section 7, a tapered section S and a squared nose 9. A central duct ldconducts the steam, an upper duct 11 the oil and the lateral ducts 12 and 13 conduct the oil and air from' the feed pipes through the inlet nozzle body.

The steam nozzle 14 is contracted in size from the bore of the steaniduct and has two opposite lrerfs 15 giving thesteam a horizontal spread. i

The mixing nozzle 16 has a cylindrical section 17 with a screwthreaded portion 18 fitting the threads 7 and is contracted with substantially parallel sides 19 and tapered top "and bottom surfaces 20 and 21. On the interior the mixing nozzle has a tapered top and bottom mixingV section 22 and 23 with a top and bottom step 24 and 25 slightly forward of the middle of the nozzle, continuing in'tapered surfaces 26 and 27 to the screwthreaded portion 18. At the sides the inside of the mixing nozzle is substantially parallel as indicated bythe numerals 28 and 29. Reverse curves 30 and 31 are therefore made where the tapered and parallel surfaces meet baok of the steps 24 and 25. The

' orice 32 follows around the end of the nozzle and is a narrow slit adapted to spread thefuel in a thin horizontal spray.

When the inlet nozzle and the mixing nozzle are fitted together .a space 33 'separates the tapered portions back of the steps and the nose 9 of'the inlet nozzle fits tight against the steps. A recess is made in the upper' surface of the inlet nozzle where the oil duct 11 joins the surface 26 to allow free i flow of the oil: andon account of the shape of the meeting surfaces the air streams from the air ducts 12 and 13 Y are converged slightly inward. A mixing chamber 34, in the space forward of the steps mixes the oil and air projected by the steam. The steam jet is so located in the liet nozzle that it impinges on the bottom 22 ofthe mixing nozzle and is deflected slightly upward thus scouring the bottom and top of themixing chamber 34 and keeping the orifice 32 clean.

The air inlet pipes are provided with check valves 35, which are proportioned in weight to respond to the variations of steam pressure, causing jets of different velocities and to maintain a check on the flow of air.

The manner of functioning ofV my oil burner is substantially as follows :#Wfhen the steam is turned on, with the oil and air Y and air are drawn into the burner -by the suction developed by the steam jet. The flow is proportionate tothe Velocity of the steam. The steam jet is spread out horizontally by the shape of the mixing nozzle and carries the oil on the ripper surface of the steam jet until t ie oil and steam are mixed and incorporated with. the air. When in operation the steam and air pipes openj oil jets keep the burner cool, `but when the jets are' shut olf'the burner is subject to the heat radiated froml the interior of the furnace, which heats-the burner to`l a higher temperature than when in use. 'The kairspace the recess-abone the'ioilinletduct; ll and the space at the outer ends .of the air ducts form air circulating spaces Vand passages aidf ingthe cooling of the burner.

' Myburner may beconsderablymodified to suit particular oil bur-ning` installations and may' be altered in design Without departing from the spi/rit thereof as setVv forth in the speeili'catien; .dra-Wings and claims.

described `my invention what l,

and mixing nozzle together.y

2. An oilburner` comprisingin combination an inlet nozzle shaped substantially as a` frus'trum of: a cone With thexsmall `end forming aan abutment nose,V saidlnozzle hauing passages therethrough-kin an azial direction for oily steam and air, a mixing nozzle tapered on its inner surface on the to and vbottom mounted on and. surrounding tie in` let nozzleA and abutting against the abutment nose, a mixing 'chamber' forward of such nose, and an orifice therefor in the form of a slot. v

3. An oil burner as claimed in claim 2 in Which the passages for oil, steam and air comprise a central steam duct7 an oil duct thereabove and a pairof air ducts on the side ofy the steam duct.

4t. An oil burner comprising in combination aninlet nozzle shaped substantially as a. frustrum of a 'cone `withV the smally end forming; an abutment nose, said nozzle hav-4 ing ductsy therethrough for oil5 steam' and air7 ka mixingnozzleu having a step in its top and bot-tom surfaces engaging the nose of the inletl nozzle, tapered top and bottom sur-,faces continuing adjacent the conedportion of the inlet nozzle but slightly spaced therefrom, and forwardly extendingtapered top -andbottom surfaces'from the said steps andhaving a slot shaped orifice curved fon Wardly in substantiallyfa semicircle.

5. Anoilburner as 'claimed in claim 4, in which the steam duct issituatedin a central position slightly'below. thecenter, the air ductsaresituated on opposite ysides, of the steam duct `and discharge-into the space between the'inlet nozzle; and the mixingnozzle andfthe oilduetis situated above the Sica-m duct and?dischargesinto thespace betuf'een the inlet nozzle andthe tapered topV surface c of the mixing nozzle extending bacluvardly fron'ithe said' step.;l f In testimony whereofl have signed my name to this Vspecification;V ,Y

@ABL A. NQRLL. 

